Glass Assesment

ASSESSMENT OF THE VISUAL QUALITY OF SINGLE GLASS PANES AND GLASS LAMINATES

1. SPHERE OF VALIDITY

This chapter refers to for the assessment of the visual quality of the exposed surface of a glass pane after the installment. It is valid for clear glass, coated glass, and glass colored throughout the mass, for both single glass panes (including heatstrengthened glass and fully tempered glass) and laminates. Restrictions are valid for glass with inserts, patterned or cast glass, and attack resistant and fire protective glazings. When using those products, the materials required mist be considered.

The quality is assessed according to the future use and the installation situation. If the client does not specify any future use, the glass is considered to be used as a vertical façade glass without any special approval requirements and with covered edges. The view and assessment direction is always the direction of the exterior view.

2. INSPECTION

Generally when inspecting, the looking trough the glazing, i.e. looking at the background, not focusing the glass surface, is decisive. The defects must not be marked during the inspection.

The glazing is inspected with a distance of 1 meter vertical from the glass surface. The permissible angle of view corresponds to the usual room use. However, the maximum are 45° to the surface. The inspection is carried out by diffuse daylight (e.g. overcast sky) without direct sunshine or artificial lighting. For interior glazings, the normal, diffuse lighting of the interior is decisive. Exterior glazings must be viewed from the normal (freely accessible) distance D_Mintot the installed glazing (however, always at least 1 m). Only defects that are not marked and recognizable from said distance are not assessed.

Inspection conditions and distance required by the product standerds for the glazings are not valid for this regulation. Only defects and effects that are recognizable by diffuse light without reflections are considered.The inspection conditions by diffuse light in the production ofNissink Business Glass b.v. are decisive.

The inspection of the glass pane is carried out in several inspection zones. The pane is thereny considered to be used as a regular façade glass with all 4 edges installed. Different inspection zones must be arranged before an order is placed.

Rebate Zone (F): width:

at least 18 mm circumferential width rebate zone insulating glass: width spacer incl. insulating glass edge seal or the area covered by a spacer

Edge zone (R):

10 % of the respective exposed dimensions in width and height

Main zone:

remaining exposed erea

The glass’ inherent color influences the entire appearance of the glass. Especially when using coatings or laminates of several layers, the effects can be recognized increasingly. When not using a low-iron glass, after a relatively short time, the glass’ color recognizably turns green. Furthermore, there are always slight variations of the raw glass material even among the same glass type by the same supplier. For an order,Nissink Business glass b.v. uses the best glass types and suppliers available at that moment if not specified distinctively. It must be arranged when placing an order should a specific product be used.

2.1. ASSESSMENT OF THE VISUAL QUALITY

Type of defect	Main zone (H)	Edge zone (R)	Rebate zone (F)
Inclusions, bubbles, spots, stains, ... 0,5 mm Ø ⁽³⁾	no restriction (with ODF ⁽⁵⁾ max. 3mm)	no restriction (with ODF ⁽⁵⁾ max. 3mm)	no restriction
Inclusions, bubbles, spots, stains, ... `>` 0.5 - 1 mm Ø ⁽³⁾	no restriction (with ODF ⁽⁵⁾ max. 3mm) no high density	no restriction (with ODF ⁽⁵⁾ max. 3mm) no high density	no restriction
Inclusions, bubbles, spots, stains, ... `>` 0,1 mm Ø ⁽³⁾⁽⁵⁾	average max. 2 defects a `<` 2mm Ø per qm no high density	average max. 3 defects a `<` 3mm Ø per qm no high density	no restriction
Scratches ⁽³⁾	Inividual length max. 15 mm, max 3 per 2qm	individual length max. 30 mm, max. 3 per qm	no restriction
Hairline scratches ⁽³⁾⁽⁴⁾	Not permitted in high density ⁽²⁾	Not permitted in high density ⁽²⁾	no restriction
Residues in the cavity (insulating glass)	Not permitted	Punctual: max 1 defect`>` 3 mm Ø per 1m edge length flat: max. 1 defect`>` 3qcm per 5 qm (color whitish, grey translucent, transp..)	not applicable

(1): Hairline scratches = not palpable damage of the surface
(2) High density: more than 4 defects in a circle Ø 20 cm
(3) Laminates and laminated safety glass: when using structures with more than 2 glass layers, the number of
permissibilities in the zones R en H increases by 50% per further layer (rounded off to full defects)
(4) Maximum size of defects with ODF (5) 5mm with core defect < 2 mm, ODF (5) 6 mm with core defect < 3 mm
(5) ODF = optically distorted fields

ASSESSMENT OF THE VISUAL QUALITY OF SINGLE GLASS PANES AND GLASS LAMINATES